I have heard nothing but great things about your product for the Ram 1500 Diesel, so I am heavily considering it. I live in California though, so I need to make sure that the truck will still pass our biannual emissions test. We bought my wife a 2013 Passat TDI new and have had to smog it, so gone are the days when Diesels do not need to be sniff tested (would love to see what you guys could do for it!). I have read in other places (see link below) that I wouldn't have trouble passing an emissions test, but 'm not sure I can trust that unless I hear it from the source. Can someone here confirm that passing smog will certainly not be an issue?

I believe you but I had an experience that makes me ask the question why yours will pass and other tunes that turn off EGR will not pass Calif smog test.

My Ford 6.0 diesel has an SCT tuner and the tunes turn off the EGR. I forgot to return my tune to stock when I took it in for the Calif smog test. It failed, the tester saying they did not get any signal or reading from the EGR sensor.

I returned home, replaced the tune with the stock tune, went back to the smog test and it passed, no problem.

Does your tune somehow allow the smog tester to see or get a valid reading? If so, how then is it turning off the EGR?

I believe you but I had an experience that makes me ask the question why yours will pass and other tunes that turn off EGR will not pass Calif smog test.

My Ford 6.0 diesel has an SCT tuner and the tunes turn off the EGR. I forgot to return my tune to stock when I took it in for the Calif smog test. It failed, the tester saying they did not get any signal or reading from the EGR sensor.

I returned home, replaced the tune with the stock tune, went back to the smog test and it passed, no problem.

Does your tune somehow allow the smog tester to see or get a valid reading? If so, how then is it turning off the EGR?

Thanks for reassuring me.

California doesn't really do a "smog test" on diesel's. Its more of a visual inspection to insure you haven't messed with any "smog" parts and when the engine is revved up you don't blow black smoke out the tail pipe. If the probe is used no acual "smog" values are taken or used in the report.

California has a new fuel distributed by Propelfuels.com its called HPR. (High Performance Renewable) it will run in any diesel. Its made from Biomass but they say it is not "Biofuel" because its refined in the same manner as regular diesel from crude oil. I went to my smog testing station out of curiosity and asked them to test my ED to see if it was any cleaner than regular diesel fuel. The above is what they told me.

Renewable
While Propel Diesel HPR does not contain biodiesel, it is manufactured from similar renewable biomass sources including recycled fats and oils. Refined from renewable biomass through advanced hydrotreating technology, Propel Diesel HPR meets the toughest specifications required by automotive and engine manufacturers. This allows Diesel HPR to be used by any diesel vehicle.

Air Quality and Environment
The California Air Resources Board classifies Diesel HPR, also known as renewable diesel, as an ultra-low carbon fuel. The fuel can achieve a 40-80% reduction in greenhouse gas emissions compared to fossil diesel. In addition, Propel Diesel HPR:
- Reduces NOx emissions by 14% and particulates (PM 2.5) by 34% compared to petroleum diesel
- Is sulfur-free, aromatics-free and virtually odorless

You said, "California doesn't really do a "smog test" on diesel's. Its more of a visual inspection to insure you haven't messed with any "smog" parts and when the engine is revved up you don't blow black smoke out the tail pipe. If the probe is used no acual "smog" values are taken or used in the report."

That was the method when California first started diesel smog testing. It's no longer a simple "look and see" process. They now "plug in" and take readings. That's how they knew my EGR sensor was not working. They also are adamant about any aftermarket parts. If they are not "certified" with a sticker in place the vehicle fails the test.

By the way, California never used the exhaust probe on diesel engines. I've been told the diesel exhaust damages the probe.

I don't mean to contradict you, just trying to keep the info current for anyone reading the post.